shiftiest

adjective

1. Subject to frequent changes in direction.
2. (of a person's eyes) Moving from one object to another, not looking directly and steadily at the person with whom one is speaking.
3. Having the appearance of being dishonest, criminal or unreliable.“He was a shifty character in a seedy bar, and I checked my wallet was still there after talking to him.”
4. Resourceful; full of, or ready with, shifts or expedients.